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How to “perfectly” override a dict?
...low is the minimal version that shuts the ABC up.
from collections.abc import MutableMapping
class TransformedDict(MutableMapping):
"""A dictionary that applies an arbitrary key-altering
function before accessing the keys"""
def __init__(self, *args, **kwargs):
self.store ...
Is asynchronous jdbc call possible?
...t understand how any of the proposed approaches that wrap JDBC calls in Actors, executors or anything else can help here - can someone clarify.
Surely the basic problem is that the JDBC operations block on socket IO. When it does this it blocks the Thread its running on - end of story. Whatever wra...
How do I set the proxy to be used by the JVM
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From the Java documentation (not the javadoc API):
http://download.oracle.com/javase/6/docs/technotes/guides/net/proxies.html
Set the JVM flags http.proxyHost and http.proxyPort when starting your JVM on the command line.
This is usually done in a shell script (in Unix) or bat file (in Wind...
Design Patterns: Abstract Factory vs Factory Method
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Hope this helps. It describes the various types of factories. I used Head First Design Patterns as my reference. I used yuml.me to diagram.
Static Factory
Is a class with a Static Method to product various sub types of Product.
Simple Factory
Is a class that can produce var...
Why does calling a method in my derived class call the base class method?
.../override.
You can imagine, that a class, when instantiated, is nothing more than a table of pointers, pointing to the actual implementation of its methods. The following image should visualize this pretty well:
Now there are different ways, a method can be defined. Each behaves different when ...
How do I create a self-signed certificate for code signing on Windows?
How do I create a self-signed certificate for code signing using tools from the Windows SDK?
5 Answers
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Difference between __getattr__ vs __getattribute__
I am trying to understand when to use __getattr__ or __getattribute__ . The documentation mentions __getattribute__ applies to new-style classes. What are new-style classes?
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How do I list one filename per output line in Linux?
I'm using ls -a command to get the file names in a directory, but the output is in a single line.
7 Answers
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Validation failed for one or more entities. See 'EntityValidationErrors' property for more details [
I am having this error when seeding my database with code first approach.
29 Answers
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Android: allow portrait and landscape for tablets, but force portrait on phone?
I would like tablets to be able to display in portrait and landscape (sw600dp or greater), but phones to be restricted to portrait only. I can't find any way to conditionally choose an orientation. Any suggestions?
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